c++/3663: G++ doesn't check access control during template instanation

[Kriang Lerdsuwanakij]

http://gcc.gnu.org/cgi-bin/gnatsweb.pl?cmd=view%20audit-trail&database=gcc&pr=3663

I have submit a patch that fixes this.  It is waiting for approval:

   http://gcc.gnu.org/ml/gcc-patches/2002-11/msg00958.html

--Kriang